Can I install only the new components rather than ...
Can I install only the new components rather than the entire release?
While it is possible for you to download only specific components in a new release from the SVN, Talend strongly recommends that you install the complete release in order to take advantage of new functionality and application improvements. Once installed, you can import your existing projects.
If you do decide to install only specific components, you are likely to miss architectural dependencies that would cause issues with your application.
Again, Talend strongly advises you to install the entire new version of an application rather than only part of it.